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1// This file is for testing running "print object" in a case where another thread2// blocks the print object from making progress. Set a breakpoint on the line in 3// my_pthread_routine as indicated. Then switch threads to the main thread, and4// do print the lock_me object. Since that will try to get the lock already gotten5// by my_pthread_routime thread, it will have to switch to running all threads, and6// that should then succeed.7//8 9#include <Foundation/Foundation.h>10#include <pthread.h>11 12static pthread_mutex_t test_mutex;13 14static void Mutex_Init (void)15{16 pthread_mutexattr_t tmp_mutex_attr;17 pthread_mutexattr_init(&tmp_mutex_attr);18 pthread_mutex_init(&test_mutex, &tmp_mutex_attr);19}20 21@interface LockMe :NSObject22{23 24}25- (NSString *) description;26@end27 28@implementation LockMe 29- (NSString *) description30{31 printf ("LockMe trying to get the lock.\n");32 pthread_mutex_lock(&test_mutex);33 printf ("LockMe got the lock.\n");34 pthread_mutex_unlock(&test_mutex);35 return @"I am pretty special.\n";36}37@end38 39void *40my_pthread_routine (void *data)41{42 printf ("my_pthread_routine about to enter.\n"); 43 pthread_mutex_lock(&test_mutex);44 printf ("Releasing Lock.\n"); // Set a breakpoint here.45 pthread_mutex_unlock(&test_mutex);46 return NULL;47}48 49int50main ()51{52 pthread_attr_t tmp_attr;53 pthread_attr_init (&tmp_attr);54 pthread_t my_pthread;55 56 Mutex_Init ();57 58 LockMe *lock_me = [[LockMe alloc] init];59 pthread_create (&my_pthread, &tmp_attr, my_pthread_routine, NULL);60 61 pthread_join (my_pthread, NULL);62 63 return 0;64}65